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Figure 1. Tunneling of apple fruit caused by larvae of the codling moth. Codling moth is the most important insect pest of apple and pears in North America. Damage is done by the larvae, which are cream-colored caterpillars that tunnel fruit and produce âwormyâ apples (Figure 1).
The larva, which is the stage of this insect's life cycle that causes the actual damage to the fruit, is similar to a typical fly larva or maggot. Other worms, especially the larvae of the codling moth, that infest the insides of apples are often confused with the apple maggot.Generally speaking, however caterpillars often feed in the appleâs core while apple maggots feed on the fruit flesh.In infested fruit, the larvae are often difficult to detect due to their pale, cream colour and small body size.The maggot stage has many enemies, including several braconid wasps: Utetes canaliculatus, Diachasmimorpha mellea, and Diachasma alloeum. The adult stage lays its eggs inside the fruit.n infested fruit, the larvae are often difficult to detect due to their pale, cream colour and small body size. The maggot stage has many enemies, including several braconid wasps: Utetes canaliculatus, Diachasmimorpha mellea, and Diachasma alloeum. The adult stage lays its eggs inside the fruit.